If you've been invited, you might be interested in reading this.

This is a group for everyone I consider to be one of my better friends here. You guys listen to me when I need someone to talk to, and that alone would probably make you an awesome person, but you guys do just so much more than that. You guys actually CARE. I just can't thank you folk enough, but I guess a group for all of you works, right? Anyway, thanks for existing in my life. I can't repeat it enough, but, thanks.

-Ash

TL;DR version - if I'd want to be in a survivor group with you in an apocalypse, you'd be here.